So I bought my buddies 89 2.5L YJ and he said it had a rough idle from just getting the vapor lines replaced recently. Said it didn’t do that before, it only is rough when it’s cold though, it will idle at 500 rpm, then after about 5 mins, picks up to about 800-900rpm and really smoothes out. When it was rough, a friend pulled the spark plug wires and each one caused a stumble except #4. There was almost no change at all. It does stumble however after it’s warmed up. Any ideas on what would cause it to have these issues only when cold?
Nick
Nick